It gives us no pleasure to report that our instincts were correct. According to Tim Graham of The Buffalo News, the Bills are indeed concerned that Kolb's latest concussion might be career-ending, and they are proceeding with that scenario in mind. A Bills source told NFL.com's Ian Rapoport, however, that it's premature for the organization to view the injury as the end of the line for the six-year veteran.

The evolution of the NFL:
Take a look at how the NFL has evolved from its humble roots, and the efforts being made to ensure it continues to grow.

In the meantime, expect Kolb to reflect on the viability of continuing his NFL career at age 29. He admittedly suffered two "major" concussions in his career before the 2011 late-season concussion that led to symptoms persisting for months after the injury.

Considering the health risks and Kolb's uneven play across 21 career starts, it's highly unlikely that he'll ever be viewed as a potential quarterback solution. He has to decide if it's worth risking brain trauma to proceed as a long-term backup.